BRD engine oil leakage under the valve-cover while DPF regeneration is in progress

[Exy82]

Hello,

I have a problem with my car. When the DPF regeneration is in progress the oil is escapes under the valve-cover.

I replaced the gasket, but it is not working. :-(

One of the injectors different than others. 3x 03G130073T 1x03G130073M

EGR valve cleaned.

In every 1000-1500 kilometers around 700ml coolant disappears from the tank.

Please HELP!

Exy